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Filed Oct '9, 1

H A WAYRINGER PROCESS OF FORMING QUARTZ'ARTICLES' His A Etern ty.

Patented Aug. 25, 1925.

UNITED STATES PATENT orries.

HENRY A. WAYRINGER, 6F SC HFJNECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELEC- TRIO COMPANY, A CORPORATION OF NEW YORK.

PHOCESS OF FOR-MING QUARTZ ARTICLES.

Application filed October 9, 1925. Serial No. 667,590.

To all whom it may concern:

Be it known that I, HENRY A. WAY- RINcnn, a citizen of the United States, re-

siding at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful improvements in Processes of Forming Quartz Articles, of which the following 1s a specification.

The present invention relates to the manufacture of quartz Ware, as for example, quartz dishes or crucibles. It is the object of my invention to provide a convenient and expeditious method of forming quartz were of desired shape.

Heretofore, quartz ware which could not be made by simple extrusion through a die has been laboriously built up from small bits softened by a-blow pipe. This process necessarily is expensive and unsuited to quahtity production. The high fusing tem perature and high heat conductivity of ,quartz renders exceedingly difficult the molding of fused uartz in the manner that fused glass is mol ed.

In accordance with my present invention, quartz articles are made by first producing large masses or ingots oi vitreous quartz in a substantially homogeneous condition, subdividing the ingot by sawing, or other mechanical method, into plates, or other suitable form,- then reheating these quartz plates to a temperature of plasticity and finally shaping the heated preformed plates to a desired form.

The accompanying drawing shows in Fig. 1 an ingot of fused quartz from which a disc has been cut; Fig. 2 shows a ressure mold and Fig. 3 a finished quartz article.

In carrying out my invention, aningot 1 of fused quartz, preferably free from bub-- same furnace or more conveniently a sec-.

ond operation in a pressure furnace, thereby 121% the evacuated cavities.

'2 thus obtained are reheated to a temperature of plasticity, and then are molded.

The molding o eraticn may be carried out in its simpiest "orrn by heating the blank on top of a mold. Of-dGSlFECi shape so that as the quartz blank is heatedsuliiciently to become yielding, say to 1700" C. or thereabouts, it will relax into the mold by its own weight. This method is suitable for the manufacture of simple concaved or dished forms. sisting of carbon, or of asuitablc refractory metah'such for example, as tungsten, may be used to carry out a molding operation on the preformed blank by means of a mechani cally operated plunger. In that case the quartz blank should be heated to a somewhat higher temperature. By the application of moderate pressure articles of regular geometric shape may be made as indicated in Fig.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. The method of manufacturing quartz articles which consists in casting fused quartz into the form of a mass having a cross-section substantially equal to the crosssection desired in the finished articles, mechanically subdividing said mass when solidified into sections, re-heatiiig said sections to a temperature of plasticity and molding to a desired form.

2. The method of manufacturing articles from quartz which consists in casting fused quartz in block form, cutting said block into ri ates after solidification, and shapingsaid plates when heated to a softening tempera 3. The method of manufacturing quartz articles of predetermined form which consists is m chanically cutting a plate from On the other hand, dies 3, 4 conan in at of solid refused quartz, heating an ingot of solid, vitreous quartz, and heatsaidp ate to a temperature of about 1700 ing said plate in a refractory mold to a C. and then molding said plate to desired temperature high enou h to cause said plate 10 form. to assume the shape 0 said mold.

'4. The method of manufacturing quartz In witness whereof, I have hereunto set articles of predetermined form which conmy hand this 8th day of October, 1923.

sistsin cutting with an abrasive a plate from HENRY WAYRINGER. 

